7.57b homework problem

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Shannon Han 2B
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Joined: Fri Sep 26, 2014 2:02 pm

7.57b homework problem

Postby Shannon Han 2B » Sun Jan 25, 2015 9:19 pm

On #57b for Chapter 7 text problems, the problem asks you to find the internal energy change for a reaction of 1.40 g of carbon monoxide with excess water vapor producing carbon dioxide and hydrogen gas in a bomb calorimeter. How do you know qreaction = - q calorimeter? Is that true for all bomb calorimeter problems? Also how do you know ∆U = q?

K Honeychurch 1K
Posts: 27
Joined: Fri Sep 26, 2014 2:02 pm

Re: 7.57b homework problem

Postby K Honeychurch 1K » Sun Jan 25, 2015 10:55 pm

Yes, it is true that qreaction=-qcalorimeter for all bomb calorimeter questions. This is because qsystem=-qsurroundings.
We know deltaU=w+q and in a bomb calorimeter volume is constant which means there is no change in volume and therefore no work done on or by the system (w=0). So, we have deltaU=q.

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